{"id":"CVE-2026-5946","details":"Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) — for example, `CHAOS` or `HESIOD`, or DNS messages that specify meta-classes (`ANY` or `NONE`) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates (`UPDATE`), zone change notifications (`NOTIFY`), or processing of `IN`-specific record types in non-`IN` data — can cause assertion failures in `named`.\nThis issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.","modified":"2026-07-08T08:13:48.446439188Z","published":"2026-05-20T13:16:40.157Z","related":["ALSA-2026:23360","ALSA-2026:24338","ALSA-2026:24339","ALSA-2026:24367","ALSA-2026:24368","SUSE-SU-2026:22198-1","SUSE-SU-2026:2289-1","SUSE-SU-2026:2616-1","SUSE-SU-2026:2617-1","SUSE-SU-2026:2673-1","SUSE-SU-2026:2676-1","SUSE-SU-2026:2779-1","openSUSE-SU-2026:10874-1","openSUSE-SU-2026:21123-1"],"database_specific":{},"references":[{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-5946"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5946.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20334"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:23360"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24338"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24339"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24367"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24368"},{"type":"ADVISORY","url":"https://kb.isc.org/docs/cve-2026-5946"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479771"},{"type":"FIX","url":"https://downloads.isc.org/isc/bind9/9.18.49"},{"type":"FIX","url":"https://downloads.isc.org/isc/bind9/9.20.23"},{"type":"FIX","url":"https://downloads.isc.org/isc/bind9/9.21.22"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/isc-projects/bind9","events":[{"introduced":"1477c19dd9a347ee19a42dac227f299a4680506f"},{"last_affected":"acf2ba4a9337bced7e666b0460db4f58a4611eb8"},{"introduced":"8db45afa1affcb823e68afdeddedf93e136f5d3e"},{"fixed":"cd4a53b4630ba8646b2071ea8161d578b4185a94"},{"introduced":"14bbdfc7b9db0870a0b8941ca8812d9983fdba1a"},{"fixed":"7d0b4d4d436e7b950225a533e5bc56d8f935cc1c"},{"introduced":"b732da695eecc0526950e2c722cde0bf23e5a070"},{"fixed":"02a7b2c8a549b79cf885d1a0cda28b74de22d197"}],"database_specific":{"source":"CPE_RANGE","extracted_events":[{"introduced":"9.11.0"},{"last_affected":"9.16.50"},{"introduced":"9.18.0"},{"fixed":"9.18.49"},{"introduced":"9.20.0"},{"fixed":"9.20.23"},{"introduced":"9.21.0"},{"fixed":"9.21.22"}],"cpe":"cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*"}}],"versions":["v9.18.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5946.json"}},{"ranges":[{"type":"GIT","repo":"https://gitlab.isc.org/isc-projects/bind9","events":[{"introduced":"1477c19dd9a347ee19a42dac227f299a4680506f"},{"last_affected":"acf2ba4a9337bced7e666b0460db4f58a4611eb8"},{"introduced":"8db45afa1affcb823e68afdeddedf93e136f5d3e"},{"fixed":"cd4a53b4630ba8646b2071ea8161d578b4185a94"},{"introduced":"14bbdfc7b9db0870a0b8941ca8812d9983fdba1a"},{"fixed":"7d0b4d4d436e7b950225a533e5bc56d8f935cc1c"},{"introduced":"b732da695eecc0526950e2c722cde0bf23e5a070"},{"fixed":"02a7b2c8a549b79cf885d1a0cda28b74de22d197"}],"database_specific":{"source":"CPE_RANGE","extracted_events":[{"introduced":"9.11.0"},{"last_affected":"9.16.50"},{"introduced":"9.18.0"},{"fixed":"9.18.49"},{"introduced":"9.20.0"},{"fixed":"9.20.23"},{"introduced":"9.21.0"},{"fixed":"9.21.22"}],"cpe":"cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*"}}],"versions":["v9.18.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5946.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}